Gripping-tool.



A. S. P. ROBINSON.

GRIPPING TOOL.

APPLICATION FILED A1 1z.z,1909.

Patented Dec. 27, 1910.

A. S. F. ROBINSON.

GRIPPI'NG TOOL.

AIYLIOATION FILED APR. 2, 1909.

Patented Dec. 2'?, 1910.

3 SHEETS-SHEET 2.

A. S. R ROBINSUN.

GRIPPING TooL.

APPLICATION FILED APILZ, 1909.

9?9563 Patented Dec. 27, 1910.

3 SHEETS-BEBET 3.

liZllFgl@ @AES A i ARTHUR SAMUEL FRANCS ROBINSON, OF BARSHAM, BECCLES, ENGLAND.

GRIPPING-TOOL.

To all whom 'it may concern:

Be it known that I, ARTHUR SAMUEL Francis ROBINSON, a subject of the King of Great Britain and Ireland, residing at Barsham, Beccles, in the county of Suffolk, England, have invented improvements in Gripping-Tools, of which the following is a specification.

This invention relates to smiths tongs, pliers, and other similar' gripping tools, which, as ordinarily constructed cannot have their jaws opening parallel er approximately parallel owing' to the jaw levers being crossed atl the fulcrum (as in scissors), and where, Vas in specially constructed power pliers, a parallel motion is obtained, the jaw opening is very limited, involving for varied sizes of work to be gripped the use of a number of different sizes of tools.

To make one pair of smiths tongs or one pair of pliers take the place of many or render them suitable for a large range of the ordinary work for which tongs and pliers are required, including gas pipe and ordinary Spanner work, tongs, pliers and similar tools are according to this invention provided with two jaws one of which is extended to form a hand grip and has fulcrumed to it a lever that is formed with a corresponding hand grip and is connected at the side of the fulerum remote from the grip by a link to the other jaw which is formed with a lateral extension pivotcd to its fellow at a point between t-he lever fulcrum and the hand grip, the pivot-al connections or certain of them being capable of adjustment whereby the range of opening and power to grip may be made suitable for a large variety of work. In some constructions a device can be provided adapted to secure the two hand grips against relative movement and thereby look the jaws in a work gripping position. In such cases the hand grip extension of the one jaw can be adapted to be readily secured to a bench or other suitable support for the purpose of acting as a vise.

Figures l and 2 of the accompanying illustrative drawings show in elevations at right angles to each other a pair of pliers constructed according to this invention. Fig. 3 is a detail view of a part thereof. Figs. 4t and 5 are similar views to Figs. l and 2 showing a pair of smiths tongs according to this invention. Figs. 6 and 7 are also Specification of Letters Patent.

Application filed April 2, 1909.

Patented ec. 2'?, 1910. Serial No. 487,425.

similar views to Figs. l and 2 showing a modified construction of smiths tongs. Fig. 8 is a detail view of parts thereof. Fig. 9 shows in elevation gas pipe gripping dies adapted to be secured to the jaws of the improved gripping tools. Fig. l0 is a plan of the dies shown in Fig. 9. Fig. l1 shows in elevation and Fig. l2 in plan a device for locking the jaws in work gripping positions, applied to the hand grip portions of the appliance, F ig. 11 also illustrating means for securing the appliance to a support.

ln the several constructions illustrated the link a is in the form of a bridle wherein the gripping jaws L, 1 are a sliding fit and is adjustably pivoted at c to one jaw b that has an L shaped extension (Z the foot of which is adjustably pivoted at e about midway down the lever arm f of its opposing jaw b1 (hereinafter referred to as the opposing aw) the power closing and opening lever g is pivoted at one end to the bridle link a at /L and is fulcrumed adjustably at 7c in a recessed extension m at the back of and below the gripping portion of the opposing jaw. Gripping the power lever g and the arm f so as to press them toward each other causes the power lever g to draw the jaws Z and 7) together by means of the bridle link u.

The work grij'iping portions of the jaws L, 711 may be separately made and each riveted between two steel plates forming the remaining portions l and .7 of the jaws (Figs. l, 2, G and 7), a portion of the handle f passing between the plates of the l. shaped jaw extension (Z. The bridle link a can be formed of one U shaped bent link riveted at the open end by a shouldered pin 7L to which the end of the power lever g is pivoted, as shown in Figs. i, 2, 3, 4t and 5.

71.1 L-, Fig. 3, are washers on the pin L between the sides of the link a and t-he lever g, so that the link sides can be straight, as shown, instead of being bent inwardly at their outer ends. Instead of a shouldered pin 7i, the link ends may, as shown in Figs. G and 8 be clamped by a bolt h2 to a ferrule 7b3 on which the lever g is pivoted. The ferrule is of such length as to prevent the lever end being nipped. This construction enables the link a to be removed when the bolt 7a2 is withdrawn, an arrangement that is desirable when the jaws E, b1 are wider than the gap between the link sides. `Series otl pin holes 0 are provided in the bridle link ci and toot otl the extension jaw Z that the jaws b1 may be brought closer together or set farther apart parallel or at any desired angle.

To increase or decrease the range ot action of the power lever g, the tulcrum pin 7c in the recessed extension m formed in the back of the opposing jaw b1 may be placed in one or other ot holes 7) provided therefor.

By withdrawing its pivot pins c and c the jaw Z) may be removed and a spare one formed especially for gripping gas pipe can be inserted in its place, or it or the opposing jaw b1, or both, may be formed to receive a gas pipe die g, see Figs. 9 and 10, which, for instance, may be recessed at the back to tit the jaw tace and be held in position by al pin r passing through it and the jaw. Each adjusting pin c, e and is threaded at one end which is screwed into the one side ot' the bridleor jaw so as to secure the pin in place.

llVhen the arm 7 is formed ot plates riveted to the jaw b1 as shown in Figs. l, 2, G and 7, a block or plate of tlber or other suitable material can be riveted between the plates thereof.

The toot. of the jaw extension Z may, as shown in Fig. i, be extended and formed with holes 0l adapted to receive a locking pin behind the 'arm g that prevents the aws opening.

1n the pliers shown in Fig. 1, the jaws Z), b1 are formed with serrated recesses suitable for gripping gas pipes and the like.

t, Figs. 6 and 7, is a slotted locking link pivoted atu to the arm g and extending between'the plates ot the arm yw being a bolt mounted in the arm f and extending through the slot of the link t and washers 50 located between the link i and the plates of the arm f.

y is a thumb nut on the bolt fw whereby the link t can be frictionally gripped, the side plates oit the arm springing sutilciently to admit of such gripping.

The slotted locking link 25 may, as shown in Figs. ll and 12 and in dotted lines in Figs. 1 and 2, be in the form of a U shaped bent link that embraces the arm To enable the appliance to be used as a vise the arm f may be tormed with holes whereby it can be readily screwed to a suitable support 1, as shown in Fig. T or be bolted between angle plates 2 screwed to such support, as shown in F ig. l1 and in dotted lines in Figs. 1 and 2. A

Vhat I claim is l. In a. gripping tool, a gripping jaw formed with a pivot hole and provided beyond said pivot hole with an l shaped extension formed with a number of pivot holes an opposing aw provided with a hand grip extension and formed with a pivot hole between the jaw part and hand grip, a pivot pin adapted to engage any one ot' the holes ot the L-shaped extension ot said gripping jaw and the pivotl hole of said opposing aw, a lever pivoted to said opposing jaw and Jformed with a corresponding hand grip, a link pivoted to said lever and formed with a number of pivot holes, and a pivot pin adapted to engage any one ot the holes of said link and the pivot hole ot' said gripping jaw. n

2. ln a gripping tool, a 4gripping Jaw formed with a pivot hole and provided beyond said pivot'hole with an L-shaped eX- tension formed with a number of threaded pivot holes, an opposing jaw provided with a hand grip extension and formed with a pivot hole between the jaw part and hand grip, a threaded pivot pin adapted to engage any one of the holes of the L-shaped extension ot said gripping jaw and the pivot hole ot said opposing jaw, a lever pivoted to said opposing aw and formed with a corresponding hand grip, a link pivoted to said lever and termed with a number ot threaded pivot holes, and a threaded pivot pin adapted to engage any one of the holes of said link and the pivot hole ot said 0ripping jaw.

3. 1n a gripping tool, a gripping jaw formed with a pivot hole and provided beyond said pivot hole with an L-shaped eX- tension formed with a number of pivot holes,

an opposing jaw provided with a hand grip v extension and formed with a pivot hole between the jaw part and hand grip, a pivot pin adapted to engage any one of the holes ot the l -shapcd extension of said gripping jaw and the pivot hole of said opposing jaw, a lever adjustably pivoted to said opposing jaw and termed with a corresponding hand grip, a link pivoted to said lever and :termed with a number of pivot holes, and a pivot pin adapted to engage any one ot the holes ot said link and the pivot hole of said gripping aw.

et. 1n a gripping tool, a gripping jaw formed with a pivot hole and provided beyond said pivot hole with an L-Shaped eX- tension formed with a number of pivot holes, an opposing j aw provided with a hand grip extension and formed with a main pivot hole between the jaw part and hand grip and with a number of lever pivot holes between the aw part and the main pivot hole, a pivot pin adapted to engage any one ot the holes ot' the l..shaped extension of said gripping jaw and the main pivot hole of said opposing aw, a lever formed with a number ot' pivot holes and formed with a hand grip, a pivot pin adapted to simultaneously engage any one of the pivot holes of said lever and any one of the lever pivot holes of said opposing jaw, a link pivoted to said lever and formed with a number ot pivot holes,

and a pivot pin adapted to engage any one of the holes of said link and the pivot hole of said gripping jaw.

In a gripping tool, a gripping jaw formed with a pivot hole and provided beyond said pivot hole with an L-shaped eX- tension formed with a number of pivot holes, an opposing aw provided with a hand grip extension and formed with a main pivot hole between the jaw part and hand grip and with a number of lever pivot holes between the jaw part and the niain pivot hole, a pivot pin adapted to engage any one of the holes of the L-shaped extension of said grip ping jaw and the inain pivot hole of said opposing j aw, a lever formed with a pivot hole and with a hand grip, a pivot pin adapted to engage the pivot hole of said lever and any one of the levei1 pivot holes of said opposing jaw, a link pivoted to said lever and formed with a number of pivot holes, and a pivot pin adapted to engage any one of the holes of said link and the pivot hole of said gripping jaw.

G. In a gripping tool, a gripping jaw :torined with a pivot hole and provided beyond said pivot hole with an L-shaped eX- l tension formed with a number of threaded pivot holes, an opposing jaw provided with a hand grip extension and formed with al inain pivot hole between the jaw part and' hand grip and with a number of lever pivot threaded holes between the jaw part and the inain pivot hole, a threaded iVot pin adapted to engage any one of tie holes of the L-shaped extension of said gripping jaw and the niain pivot hole of said opposing jaw, a lever formed with a number of pivot holes and formed with a hand grip, a threaded pivot pin adapted to simultaneously engage any one of the pivot holes of said lever and any one of the lever pivot holes of said opposing jaw, a link pivoted to said lever and formed with a nuinber of threaded pivot holes, and a threaded pivot pin adapted to engage any one oit' the holes of said link and the pivot hole of said gripping jaw.

Signed at London England this 24 day of March 1909.

ARTHUR SAMUEL FRANCIS ROBINSON.

lVitnesses H. D. JAMESON, CHARLES Cors. 

